ci: add free disk space step to clippy and cargo deny jobs

[danyalprout]

Summary

• The Clippy and Cargo Deny CI jobs were failing with No space left on device errors during the rust-cache restore step
• The Build and Test jobs already had the jlumbroso/free-disk-space step but Clippy and Cargo Deny were missing it
• Adds the same free disk space step to both jobs, freeing ~30GB by removing preinstalled Android SDK, .NET, Haskell, and swap storage

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1